Once I upgrade to Premier Membership, can I ever revert back to Basic Service?

Any ShipitAPO member who is has registered with the Premier Service will maintain that service until the end of the service year. You can of course, opt not to re-enroll. On your anniversary date, when we attempt to renew your Premier Membership, if you have opted not to re-enroll as a Premier Member prior to your anniversary date, your account will automatically revert to Basic membership, which is free.